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堆石料工程特性及面板堆石坝应力变形研究(孙振远)

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石料工程特性及面板堆石坝应力变形研究水利论文K(T)Q gk

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【作者】孙振远 【导师】李国英
|4u^@T(N,dlP}0【作者基本信息】南京水利科学研究院,岩土工程,2003年,硕士水利论文.R H,Sni"Vkv"V

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【中文摘要】 本文较为系统地分析研究了堆石料的工程特性,开展了堆石料的浸水变形试验和流变试验研究,重点研究了堆石料的流变特性及其对混凝土面板堆石坝应力变形的影响。 (1)首先回顾了混凝土面板堆石坝的发展和研究进程,提出了当前研究工作中存在的问题; (2)对比分析了混凝土面板堆石坝变形分析中堆石体的本构模型,探讨了计算中存在的问题和需要考虑的因素,并对接触面单元的选用进行了讨论; (3)研究讨论了堆石料的流变机理以及堆石料流变计算模型,提出了考虑围压和轴向荷载的最终体积流变计算模型,并对以往最终剪切流变计算模型进行了改进; (4)综述了堆石料工程特性研究现状及发展趋势,论述了堆石料的变形特性和强度特性,并进行了堆石料浸水变形试验,探讨了堆石料湿化变形的计算方法及其对坝体变形的影响; (5)首次针对具体工程主要堆石料的流变特性开展了大量试验研究。试验采用大型三轴仪进行,每种堆石料进行了三种围压试验,每种围压下又分三种轴向受力状态,根据流变试验结果分析了坝料的流变变形特性,得出了流变模型参数。 (6)根据堆石料流变试验所得的流变模型参数,对新建的公伯峡水电站混凝土面板堆石坝进行了计入和不计入流变因素的坝体...更多变形特性分析计算,研究了堆石体流变对面板坝应力变形特性的影响,为新建坝的设计和施工提供了重要的参考依据。  还原水利论文K"{/G N,Gi2HN~

bA C2W[brS0【英文摘要】 In this paper the engineering characteristics of rockfill materials are systematically discussed and analyzed. Wetting experiments as well as rheological experiments of rockfill materials are carried out, aimed at their deformation behavior especially rheological characteristics and their effect on the deformation of dam body of Concrete Face Rockfill Dam (CFRD).The main contribution includes:(1) The development of CFRD and its study actuality are reviewed. The existing problems in the theoretical research of CFRD are then brought out.(2) The constitutive models of the rockfill materials are compared and some problems and factors that should be taken into account are put forward. The choice of interface elements is discussed.(3) The principle and the creep model of the rockfill materials are discussed, furthermore, an improved creep model considered confining pressure and axial loading is proposed.(4) The study actuality of engineering characteristics of rockfill materials and their tr...更多ends are summarized. Their deformation and strength characteristics are also discussed. The wetting deformation experiments as well as their numerical analyses are carried out.(5) Creep tests of rockfill materials of a specified CFRD are firstly carried out to obtain the creep parameters that can be used to better understand the rheological characteristics of the materials. A large-scale triaxial apparatus is adopted for the tests .The tests are performed under three different confining pressures for each rockfill material, and three different kinds of axial loading is applied under each confining pressures. The rheology of the rockfill materials are presented and analyzed based on the test results, and the creep parameters are obtained.(6) Based on the parameters achieved in the rockfill creep experiments, the deformation characteristics of dam body of Gongboxia CFRD are studied through a contrast between considering rockfill creep deformation factors and not considering them. The rationality of the present creep model and the reliability of its creep parameters are verified. And an important reference to the design and construction of new building CFRD is offered.  还原水利论文7n*cpcWgD k

'e+Oo6dz0【中文关键词】 混凝土面板堆石坝; 堆石料; 工程特性; 浸水变形试验; 流变试验; 本构模型; 流变模型水利论文/j S6p?$bA
【英文关键词】 CFRD; Rockfill material; Engineering characteristics; Wetting deformation experiment; Creep experiment; Constitutive model; Creep model水利论文%~0g/\ RwI)wP v
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TAG: 特性 应力 堆石坝 石料 孙振远
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